300 miles is quite a lot! What car is it on? Is doing your self not an option? Personally, i wouldnt risk it
Official answer: Don't drive it.
Secret answer: I've done over 300 miles in a Punto on a trailing arm bearing which started with 1" of play in the off-side rear wheel and ended with all the rollers missing from the bearing and 6" of play in the wheel.
To check, jack the wheel off the ground and grab it at both top/bottom and both sides and feel for any movement in it.
All those condoning driving it should explain that to a local girl who noticed a wheel bearing noise and had the wheel fly off at 80MPH just 50 miles later.
Would you be fine, maybe. Is it worth risking your life for? Probably not.
As none of us are driving around in this particular car with this particular bearing noise then the sensible choice is to not risk it.
Skoda Fabia. I'm not very good at DIY so doing it myself isn't an option!